Dr. Geis graduated from Loyola University School of Medicine in Chicago. He interned in the Department of Surgery at the University of Chicago and was a resident at Loyola University Medical Center. He completed Fellowship in Transplantation and was Chief of Transplantation in the Department for many years.

Dr. Geis’ recent articles and presentations focus on the use of Laparoscopy in Surgical Abdominal Emergencies, Laparoscopic Ventral Hernia Repair, MIS Colo-rectal Procedures, Hiatus Hernia Repair and the use of "Single Incision" Laparoscopic Surgery. Most recently, he has led the development of single site mini-laparoscopy and use of Robotics to assist in complex laparoscopy.

Dr. Geis is certified by the American Board of Surgery, and a member of 39 Surgical Societies including The American College of Surgeons, Founders of Laparoscopic Surgery, American Society for General Surgeons, and is a past President of the Society for Laparoscopic Surgery.